JP2536066Y2 - Weft detection device in loom - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for electrically detecting a weft in a loom such as a water jet loom, and more particularly to a device for detecting a weft using a pair of electrodes electrically short-circuited by the weft.

[0002]

2. Description of the Related Art As one of electric weft detecting apparatuses, there is an apparatus using a pair of electrodes electrically short-circuited by a weft. In this weft detection device, both electrodes are attached to the reed at intervals in the direction in which the weft travels (left-right direction), and when the weft is beaten, it comes into contact with the weft and is electrically connected. A short circuit occurs, so that the weft is detected.
However, in such a device, the contact portions of the two electrodes with the weft are in the warp feed direction (in the present invention, the feed direction of the warp is "front and rear direction", the warp supply side is "rearward", and The winding side is referred to as “forward”.), And the weft and the electrode may not come into contact with each other because they are merely configured to extend in the vertical direction at the same position. In addition, even if they are in contact, the contact pressure of the weft may not be sufficiently high. In such a case, no short circuit occurs due to poor contact between the weft and the electrode, so that the weft is not detected.

[0003] As another one of the electric weft detecting devices,
There is a device in which one electrode is attached to a reed and the other electrode is attached to a predetermined position on the side of a woven fabric (Japanese Patent Laid-Open No. 61-893).
No. 56). In this weft detecting device, the movable electrode attached to the reed intersects with the fixed electrode attached at a predetermined position on the woven fabric, as a result of the beating, so that both electrodes press the weft together. The two electrodes are short-circuited. However, such devices often do not allow the weft to cross the fixed electrode. In such a case, since the remaining weft is always in contact with the fixed electrode, even if the weft insertion is poor, both electrodes are
A short circuit is caused by the remaining weft, and as a result, a weft detection signal is output even if the weft insertion is poor.

[0004] As still another electric weft detecting device, there is a device in which both electrodes are mounted at predetermined positions on the side of a woven fabric with a space therebetween in the flight direction of the weft (Japanese Utility Model Application Laid-open No. 61-61). 7
No. 3885). In this weft detection device, the tips of both electrodes are bent so as to intersect in an X-shape when viewed from the flight direction of the weft, and the weft is beaten by The electrode is contacted. But,
In such a device, since the weft is moved by the reed, only the two electrodes are brought into contact with the weft, the weft and the electrode may not come into contact with each other. Since no short circuit occurs due to poor contact between the weft and the electrode, no weft is detected.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a weft detecting device for a loom, which can detect a weft accurately.

[0006]

The weft detecting device according to the present invention has a pair of first contact portions that are in contact with the weft, the first contact portions being spaced from each other in the flight direction of the weft and by the weft. A first actuator arranged to act as electrode portions that are electrically short-circuited to each other, and a second actuator that is in contact with the weft.
And the second contact portion includes a second actuator that can move in and out between the first contact portions. Of the first and second actuators, one of the actuators is at a fixed position where the contact portion thereof is rearward with respect to the weaving, and the other actuator is the contact portion where the weft is moved by the reed as the reed moves. Each of the reeds is attached to the reed so as to press against a contact portion of one actuator. The rear end surface of the one actuator is an inclined surface that allows the pressed weft to cross over a portion including the contact portion of the one actuator as the other actuator moves.

Another weft detecting device according to the present invention is a first and a second actuator having a contact portion that comes into contact with the weft, wherein the two contact portions are spaced from each other in the flight direction of the weft and are mutually separated by the weft. Including first and second actuators arranged to act as electrically shorted electrodes. Of the first and second actuators, one of the actuators is at a fixed position where the contact portion thereof is rearward with respect to the weaving, and the other actuator is the contact portion where the weft is moved by the reed as the reed moves. Each of the reeds is attached to the reed so as to press against a contact portion of one actuator. The rear end surface of the one actuator is an inclined surface that allows the pressed weft to cross over a portion including the contact portion of the one actuator as the other actuator moves.

The other actuator attached to the reed is positioned such that each time the beating is performed, the contact portion of the other actuator is rearward (on the warp supply side) with respect to the contact portion of the one actuator attached to the fixed position. , And a position on the front side (the front side of the weaving). At this time,
Since the contact portion of the other actuator passes beside the contact portion of one actuator, the contact portions of both actuators intersect when the reed is moved toward the weaving front.

[0009] When the reed is moved toward the weaving front, the inserted weft is beaten before the weaving while in contact with the contact portion of the other actuator. When the reed is moved toward the weaving, the weft is brought into contact with the two electrode parts, whereby the two electrode parts are electrically short-circuited. As a result, the weft detecting device detects that there is a weft.

When the other actuator is moved toward the cloth fell, the contact portions of both actuators intersect with the movement of the reed, so that the weft is in contact with the contact portion of the other actuator and the other yarn is in contact with the other actuator. The actuator is pressed against the contact portion of one actuator.
This ensures that the weft is in contact with both electrode portions.

Further, the weft is moved by the other actuator toward the weaving together with the reed,
The actuator is further moved toward the weaving front while being in contact with the contact portions of both actuators. That is, the weft is moved while changing the contact position with respect to both electrode portions. Thereby, even if a part of the surface of the electrode portion is electrically insulated due to corrosion or the like, when the weft contacts another portion of the electrode portion, the weft reliably electrically short-circuits both electrode portions. be able to.

Further, the weft is moved along the inclined surface of one of the actuators by the movement of the other actuator to the side before the weaving, and then climbs over the portion including the contact portion of the one actuator, and then moves on the side of the weaving. Moved to Thereby, the weft separates from the contact portion of the one actuator and is entangled with the weft catching yarn.

According to the present invention, since the contact portions of the two actuators intersect with the movement of the reed, the weft can reliably contact the two electrode portions, and thus the weft can be reliably detected. In addition, since the weft is moved while changing the contact position with respect to both electrode parts, the two electrode parts are reliably short-circuited, and the contact period of the weft with both electrode parts is prolonged, so that the weft is more reliably detected. can do. Further, since the weft is moved to the side before weaving over the portion including the contact portion of the one actuator, the weft does not remain at the contact portion of the one actuator. The weft can be accurately detected without being short-circuited by the weft.

A contact surface for contacting the weft is formed at the contact portion of the other actuator and on the side of the one actuator, and the other actuator is provided with a reed wing surface in the traveling direction of the warp. It is preferable that the reed wings are arranged at positions where the reed wings are not arranged so as to be located at the same position as or behind the position. Thus, at the time of weft insertion, the leading end of the weft and the contact portion of the other actuator do not interfere with each other, so that poor weft insertion, looseness of the weft, and the like due to the interference between the two do not occur. Further, since the weft insertion space formed by the warp and the reed is substantially widened, the weft insertion period can be made longer than that of the conventional device, and therefore, the weft insertion operation is stabilized.

[0015] The one actuator can be arranged at a position where a portion including the contact portion is rearward with respect to the weave. The inclined surface is a surface in which one end in the up-down direction is rearward in the running direction of the warp with respect to the other end.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS.
Makes the weft 12 fly into the opening 18 formed by the plurality of warps 16 by flying the weft 12 in the direction of the arrow 14 by a water jet, and then beats the weft 12 to the weave 22 with a reed 20. Thus, the woven fabric 24 is used in a loom such as an air or water jet loom for producing the woven fabric 24.

The weft detecting device 10 comprises a pair of first actuators 26 attached to the reed 20 at intervals in the flight direction of the weft 12, and a second actuator 26 attached to a fixed position on the side of the woven fabric 24. And an actuator 28.

Each of the first actuators 26 has a contact portion 30 that comes into contact with the weft yarn 12 during beating. Each contact part 3
Among 0, the surface in contact with the weft 12, that is, the front surface is a flat surface extending in the up-down direction. Each of the first actuators 26 has a flat surface that is the same as or slightly behind the position of the reed surface (the surface on the side before weaving) of the reed 32 of the reed 20 in the running direction of the warp yarn 16 (before weaving 22). (Refer to FIG. 3) to the reed 20. The reed at the place where the first actuator 26 is arranged has been removed.

The contact portions 30 of the first actuators 26
Is formed of a conductive material, and a predetermined voltage is applied. Therefore, the both contact portions 30 function as a pair of electrode portions that are electrically short-circuited when the weft 12 contacts.

In the illustrated example, both first actuators 2
6 are members independent of each other. However, the two first actuators 26 may be insulated and connected to each other at the ends opposite to the contact portions 30.

The second actuator 28 includes a base 34
And a pair of arms 36 extending in parallel from the upper and lower edges of the base to the rear in the running direction of the warp 16 (see FIG. 2).
The distal ends of the arms 36 project inward, and form contact portions 38 that come into contact with the weft 12 during beating.
Thereby, a space 40 is formed in the second actuator 28.

The rear end surfaces of both contact portions 38 are inclined surfaces in which one end in the up-down direction is rearward with respect to the other end and opposite to each other. In other words, the rear end surface of the lower contact portion 38 is an inclined surface whose lower end is rearward with respect to the upper end, and the rear end surface of the upper contact portion 38 is an inclined surface whose upper end is rearward with respect to the lower end. Have been. As a result, a space 42 having an eight-shaped cross section that gradually increases rearward is formed by the two contact portions 38 at the rear of the second actuator 28.

The second actuator 28 has such a size and shape that at least both the arm portions 36 and the both contact portions 38 can enter between the contact portions 30 of the first actuators 26 in the flight direction of the weft 12. Have.

The second actuator 28 is configured such that at least both arms 36 and both contact portions 38 are connected to each other by the attachments such as the bracket 44 and the attachment piece 46 in the traveling direction of the weft 12. The loom is attached to the temple bar 48 of the loom so as to be between 30 and the both contact portions 38 are behind the weaving front 22.

When the weft 12 is inserted into the opening 18 by a water jet or the like, the reed 20 is operated. As a result, the inserted weft is beaten by the weaving front 22 and moved to the space 40 via the space 42 to be entangled with the weft catching yarn 50. Thereafter, the weft is cut between the woven fabric 24 and the second actuator 28 by means such as a heat cutter while the weft remains in the space 40 of the second actuator 28.

When the reed 20 is moved toward the weave 22, both actuators 26 are moved together with the reed 20,
As a result, the contact portions 30 of both actuators 26 pass on both sides of the contact portion 38 of the actuator 28. Therefore, the contact portions 30 and 38 of the actuators 26 and 28 intersect with each other as the reed 22 moves.

When the reed 20 is moved toward the weave 22, the weft 12 is moved toward the weave 22 while being in contact with both electrodes, that is, both contact portions 30. For this reason, when the reed 20 is moved toward the weave 22, the weft 12 is brought into contact with both contact portions 30 acting as electrode portions,
As a result, both contact portions 30 are electrically short-circuited, and as a result, the weft detecting device 10 detects that there is a weft.

Due to the intersection of the contact portions 30 and 38 when the actuator 26 is moved toward the weave 22, the weft 12 is brought into contact with the contact portion 30 of the actuator 26 while the contact portion of the actuator 28 is in contact with the contact portion 30 of the actuator 26. 38. Thereby, the weft 12
Is securely contacted with both contact portions 30 acting as electrode portions.

Further, the weft 12 is moved by the actuator 26 together with the reed 20 toward the weave 22, so that the contact portions 30, 3 of the actuators 26, 28 are formed.
8 is further moved toward the weave 22 while in contact with the cloth 8. At this time, the weft 12 is moved while changing the contact position with respect to both contact portions 30 acting as electrode portions. Thereby, even if a part of the surface of the contact portion 30 acting as an electrode portion is electrically insulated due to corrosion or the like, the weft acts as an electrode portion when it comes into contact with another portion of the contact portion 30. The two contact portions 30 are reliably electrically short-circuited.

Further, the movement of the actuator 26 toward the weave 22 causes the weft yarn 12 to move to the actuator 28.
Is moved along the rear end surface, that is, the inclined surface, and then is moved to the space 40 over the contact portion 38 of the actuator 28. As a result, the weft 12 is
8 and is entangled with the weft catching yarn 50.

If a space 42 having an eight-shaped cross section is formed at the rear end of the actuator 28 as in the weft detecting device 10 described above, the weft 12 can be in contact with both the contact portions 30 and one of the contact portions 38.
And the weft can be detected more accurately. However, one contact portion 38 need not be formed.

In the above embodiment, in addition to the second actuator 28, another second actuator 28 is connected to one of the contact portions 3 of the first actuator 26.
0 can be arranged on the temple bar at intervals in the weft flight direction so that 0 can enter and exit between the contact portions 38 of the second actuators. At this time, instead of using both contact portions 30 of the first actuator 26 as electrode portions that are short-circuited to each other by a weft, a pair of second actuators 2 are used.
The two contact portions 8 can be electrode portions that are short-circuited by the weft. In this case, the first actuator 26 is only one of the first actuators 26 that enters and exits between the contact portions 38 of the second actuators 28, and the other is the first actuator 26.
May be omitted.

Further, in the above embodiment, both contact portions 30
Instead of the electrodes being short-circuited to each other by wefts, the actuator 26 is formed as one electrode of a forked shape connected by a conductive member at the base thereof, and the actuator 28 is formed as the other electrode. May be used as one electrode part, and the contact part 38 may be used as the other electrode part. Alternatively, one of the two bifurcated contact portions 30 may be omitted, and the contact portion 30 of one actuator 26 and one contact portion 38 of the actuator 28 may be electrode portions that are short-circuited by weft. In any case, since both electrode parts are largely separated with the movement of the reed 20,
It is possible to prevent a short circuit between both electrode portions due to lint or the like.

Further, a pair of the second bars is attached to the temple bar.
Even when the actuator 28 is mounted, both the second actuators 28 are formed as one forked electrodes connected by a conductive member at their bases, and the first actuator 26 mounted on the reed is used as the other electrode. Is also good.

In any of the above arrangements, the contact portion of the actuator attached to the temple bar is an inclined surface with one end in the up-down direction being backward with respect to the other end, and the contact portion of the actuator attached to the reed is provided. Is preferably a flat surface extending in the vertical direction.

In any of the above arrangements, the contact portions of the two actuators intersect as the reed moves, so that the weft reliably contacts the two electrode portions, and thus the weft can be reliably detected. . In addition, since the weft is moved while changing the contact position with respect to both electrode parts, the two electrode parts are reliably short-circuited, and the contact period of the weft with both electrode parts is prolonged, so that the weft is more reliably detected. can do. Furthermore, since the weft passes over the part including the contact part of one actuator, it is moved to the side before weaving,
The weft does not remain at the contact portion of one of the actuators, so that both electrode portions are not short-circuited by the previously inserted weft, and the weft can be accurately detected.

In the case of a yarn type having a low hydrophilicity, it is preferable that water is jetted from the water supply pipe 52 shown in FIG. 2 toward the weft when the weft comes into contact with both electrode portions. A sprayer may be provided instead of the water supply pipe. Furthermore, when one actuator and the other actuator intersect, a short circuit between the two electrodes due to the weft is ensured.
At this time, the contact portion is covered on the weft insertion side of the actuator disposed at the fixed position in order to prevent the two electrodes from being erroneously short-circuited due to the spray water for weft insertion falling on the electrode portion. A waterproof plate 60 may be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a weft detecting device of the present invention is arranged on a loom.

FIG. 2 is a side view of the weft detecting device shown in FIG.

FIG. 3 is a sectional view showing a positional relationship between a reed wing surface of a reed and a contact surface of an actuator attached to the reed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Weft detection device 12 Weft 16 Warp 20 Reed 22 Pre-weaving 24 Woven fabric 26, 28 Actuator 30, 38 Contact part 32 Reed feather

Claims (4)

(57) [Scope of request for utility model registration] A first contact portion which is in contact with the weft and has an interval in the flight direction of the weft and acts as an electrode portion electrically short-circuited to each other by the weft; And a second actuator having a second contact portion that is in contact with the weft, the second contact portion having a second contact portion that can enter and exit between the first contact portions. Of the first and second actuators, one of the actuators is at a fixed position where the contact portion thereof is rearward with respect to the weaving front, and the other actuator is to move the weft at the contact portion thereof to move the reed. Together with the reed to press against the contact part of the one actuator,
A loom, wherein the rear end surface of the one actuator is an inclined surface that allows the pressed weft to cross over a portion including the contact portion of the one actuator with the movement of the other actuator. Weft detection device. 2. A first and a second actuator having a contact portion to be in contact with a weft, said contact portions being spaced from each other in a flight direction of the weft and being electrically short-circuited to each other by the weft. A first arranged to act as
And one of the first and second actuators, wherein one of the actuators is at a fixed position where the contact portion thereof is rearward with respect to the weave, and the other actuator is a weft at the contact portion thereof. Are attached to the reed so as to press against the contact portion of the one actuator with the movement of the reed, and the rear end face of the one actuator has a pressed weft with the movement of the other actuator. A weft detecting device in a loom, wherein the inclined surface is a slanted surface that allows a portion including a contact portion of the one actuator to get over. 3. The contact portion of the other actuator,
The other actuator has a flat surface in contact with the weft on the front side, and the other actuator is disposed at a position where the reed is not disposed, such that the flat surface is located at the same or behind the reed surface. The weft detecting device according to claim 1 or 2, wherein 4. The weft detecting device according to claim 1, wherein the inclined surface is a surface in which one end in the up-down direction is rearward with respect to the other end.